I understand the verb "become" and came across "has become" but haven"t seen "has became" in a sentence before.

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This is a present perfect tense however in dorn construction. The existing perfect building and construction is Has/have+past particple

I do this wrong once, once I was twelve. It"s because typical verbs have same past and past participle forms. But, become is an rarely often rare verb, became is past tense and also become is past participle.

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become -> became -> become

"to become" is irregular and also the author used the wrong. He had actually to usage "become" due to the fact that it is the third type (past participle) which is needed.

Present Perfect (active): have/has + past participle


The writer should have actually written: It became or has become, if nobody else talks around it then they could write had actually become. If discussions to be still underway climate maybe offered as a jet in itself, "Having become a topic discussion.."

Wrong, since it"s pertained to the present, it"s no at part remote past time. What lock really want to say is: 

Drug policy reform has additionally recently /lately come to be a object of international debate

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